The L484 is an integrated circuit designed for use with an NPN darlington in breaker less ignition systems with magnetic pickup sensors and high energy ignition coils. A key feature of the L484 is flexibility. It can be used with a wide variety of magnetic sensors thanks to the special design which has two input pins from the pickup ; the first is the zero crossing detector for the ignition command and the second pin is used to cal-culate the dwell time. Moreover another pin is used to adapt the L484 to various pickup types. Other features of the device include darlington over-voltage protection, dump protection, a supply voltage range of 6-28 V.